Question

Which of the following accepts terminal electron during aerobic respiration?

• A. Molecular $O_2$
• B. Molecular $H_2$
• C. Molecular $C{O}_2$
• D. $NADP{H}_2$

Answer 1

The correct option is A Molecular $O_2$

Although the aerobic process of respiration takes place only in the presence of oxygen, the role of oxygen is limited to the terminal stage of the process. Yet, the presence of oxygen is vital, since it drives the whole process by removing hydrogen from the system. Oxygen acts as the final electron acceptor. It accepts electrons from cytochrome $a$-$a_3$ and forms water molecule.